Container for volatile liquids



Sept. 24, 1929,

c. L. DAY v CONTAINER FOR VOLATILE LIQUIDS Filed D80. 21, 1927 Patented Sept. 24, 1929 UNITED STATES PATENT OFFICE CLAYTON L; DAY, OF NEW YORK N. Y., ASSIGNOR '1'0 CHICAGO BRIDGE & IRON 00., A.

CORPORATION 01 ILLINOIS Application filed December 21, 1927. Serial No. 241,608.

Containers of the type referredto are preferably provided with a more or less flattened "roof on a cylindrical shell. When the con-- ta-iner is so designed, it is contemplated that the total upward gas pressure against the roof tending to draw up on the side wall and force the bottom into spherical shape will be balanced to some extent by the-weight of liquid in the tank. In a container of this kind, 1 there must be some means for venting the pressure in the tank in the event the liquid level reaches a predetermined minimum height.

- One of the features of my invention is the provision of simple automatic means for relieving the gas ressure in the event the li uid level is lower than the level necessary to alance the internal pressure against the roof.

Other features and advantages of my invention will appear more fully as I proceed with my specification.

In that form of device embodying my invention shown in the accompanying drawings, Figure 1 is a vertical sectional view taken as indicated by the line 1 of Fig. 2, and Fig. 2 is a top plan view.

As shown in the drawings, the tank or container may include the well known cylindrical shell 10 with the bottom 11 and the standard dome roof 12 designed for internal pressure. 13 indicates liquid in the tank, and in a design of this kind the weight of said liquid is utilized to counterbalance the upward gas pressure against the roof 12. 13*{indicates the minimum height of liquid required to balance the predetermined gas pressure.

In a tank of this kind, therefore, there must be some means for venting the internal pressure in event therliquid level drops below that indicated by 13. This is accomplished by providing a vent pipe 14 extending above the roof 12 as indicated by 14 to give the liquid gas pressure; In other words, thd'head of liquidin the pipe 14 will determine the internal gas pressure to be held. The lower end of the pipe 14 as indicated b 14 is at the same height as the minimum iquid level indicated by 13, so that if the liquid drops below this level, the head of liquid 1n the pipe will be lost and the gas pressure vented.

The automatic venting means shown is a very simple attachment and eliminates the necessity of anchoring theshell at its base to prevent its assuming a. tendency toward sphericity or providing other'means for counterbalancing the upward gas pressure against the roof 12.

A While I have shown and described certain embodiments of: my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention disclosed in the appended claims, in which it is my intention to claim all novelty in my invention as broadly as possible in view of the prior art.

What I claim is new, and desire to secure by Letters Patent, is

1. In combination with a closed container for volatile liquids with internal gas pressure, having a substantially flat bottom constructed of sheet material subject to distortion by excessive internal gas pressure in the container if not held down by a certain amount of liquid, ,means for automatically venting the internal gas pressure upon the liquid dropping to a predetermined level, said means comprising a vent pipe with its lower end in the container at substantially the minimum height of the 85 liquid at which the pressure is to be vented, and its upper end outside of the container.

2. In combination with a closed container for volatile liquids with internal gas pressure, having a substantially flat bottom constructed of sheet material subject to distortion by excessive internal gas pressure in the container if not helddown by a certain amount of liquid, means for automatically venting the 5 9 internal gas pressure upon the liquid dropping to a predetermined level, said means comprising a vent pipe with its lower end in the container at substantially the minimum height of the liquid at which the pressure is to be vented, and its upper end outside of the container at a suflicient height to maintain the desired internal pressure when the lower end of the vent pipe 1s immersed in the liquid. In witness whereof, I have hereunto set my hand this 12th day of December, 1927.

CLAYTON. L. DAY. 

